/Engine/Source/Runtime/Experimental/Chaos/Public/GeometryCollection/Facades/CollectionHierarchyFacade.h
Get the root indicies
static [TArray](API\Runtime\Core\Containers\TArray)< int32 > GetRootIndices ( const [TManagedArrayAccessor](API\Runtime\Chaos\GeometryCollection\TManagedArrayAccessor)< int32 > & ParentAttribute )